Four Percent Busy
A box with 8 GB of RAM and 32 GB of swap runs four processes, each with a working set of about 3 GB. Monitoring shows:
| metric | before | now |
|---|---|---|
| major page faults / s | 20 | 200,000 |
| CPU utilization | 78% | 4% |
| swap device utilization | 3% | 100% |
Adding a fifth identical process makes every number worse. What is going on, and what actually helps?
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